Developer: Walaber

Walaber is the independent developer behind the JellyCar games. Reading the book Racing the Beam made him want to try the Atari 2600, and the result was Wall Jump Ninja, sold on cartridge by AtariAge. It is written in assembly and fits in 4K. A ninja in training bounces between two walls, dodging spikes, while the “death beam” closes in. The site has all three builds: NTSC, PAL and PAL60. The game is the same in each; only the timing and colours differ.
Start with the NTSC version below and play it in your browser.